CN-121978088-A - Reagent for rapidly detecting alkalinity of industrial boiler water and application thereof

Abstract

The invention discloses a reagent for rapidly detecting the alkalinity of industrial boiler water and application thereof, belonging to the technical field of water quality analysis chemistry. The alkalinity reagent of the invention is divided into a phenolphthalein alkalinity reagent A, a phenolphthalein alkalinity reagent B, a full alkalinity reagent C and a full alkalinity reagent D. The invention constructs a three-dimensional control detection system of 'water quality limit value-sample quantity-reagent quantity', two levels are arranged in each dimension, a multiplication relation is designed between the two levels of the two dimensions of the sample quantity and the reagent quantity, the reagent purchasing difficulty can be solved, no toxic components are easy to prepare, special approval is not needed in purchasing, the visual detection can be carried out, the endpoint color is easy to distinguish, the pertinence is strong, the boiler pollution discharge is guided, and the energy conservation and the emission reduction are realized.

Inventors

• LU YAO
• XIONG LIBIN
• QU BINGXIAN

Assignees

• 江苏省特种设备安全监督检验研究院

Dates

Publication Date

20260505

Application Date

20251217

Claims (10)

1. 1. The reagent for rapidly detecting the alkalinity of industrial boiler water is characterized by comprising, by mass, 0.5-1.5 parts of a solid strongly acidic reagent, 0.02-0.05 parts of an indicator and 6-8 parts of an anti-caking agent, 1-3 parts of the solid strongly acidic reagent and 6-9 parts of the anti-caking agent, by mass, 2-4 parts of the solid strongly acidic reagent, 0.02-0.05 parts of the indicator and 6-8 parts of the anti-caking agent, and 6-8 parts of the full-alkalinity reagent.
2. 2. The reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 1, wherein the solid strongly acidic reagent in the phenolphthalein alkalinity reagent A, the phenolphthalein alkalinity reagent B, the total alkalinity reagent C and the total alkalinity reagent D is one or more selected from sodium bisulfate and sulfamic acid.
3. 3. The reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 2, wherein the solid strongly acidic reagent in the phenolphthalein alkalinity reagent A, the phenolphthalein alkalinity reagent B, the total alkalinity reagent C and the total alkalinity reagent D is sodium bisulfate.
4. 4. The reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 1, wherein the indicator in the phenolphthalein alkalinity reagent A is selected from phenolphthalein, and the indicator in the total alkalinity reagent C is selected from one or more of methyl red and methylene blue.
5. 5. The reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 1, wherein the anticaking agent in the phenolphthalein alkalinity reagent A, the phenolphthalein alkalinity reagent B, the total alkalinity reagent C and the total alkalinity reagent D is one or more selected from mannitol, sodium chloride and microcrystalline cellulose.
6. 6. The reagent for rapidly detecting industrial boiler water alkalinity according to claim 5, wherein the anticaking agent in the phenolphthalein alkalinity reagent A, the phenolphthalein alkalinity reagent B, the total alkalinity reagent C and the total alkalinity reagent D is mannitol.
7. 7. The method for preparing a reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 1, wherein the solid strongly acidic reagent, the indicator and the anticaking agent are mixed in proportion, and then ground uniformly at the room temperature with a grinder at the rotation speed of 2000r/min, and dried and stored to obtain the alkalinity reagent.
8. 8. Use of the reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 1 for detecting the alkalinity of industrial boiler water.
9. 9. Use of an agent for rapid detection of industrial boiler water alkalinity according to claim 8, for detection of industrial boiler water alkalinity, characterized in that: The phenolphthalein alkalinity test comprises the following steps: 1) The basic detection comprises the steps of mixing a single phenolphthalein alkalinity reagent A with a single water sample, oscillating for 10-30 seconds, and observing and developing color, wherein if the color is not developed, the phenolphthalein alkalinity is less than 4mmol/L, and if the color is red, the phenolphthalein alkalinity is more than or equal to 4mmol/L; 2) Dynamically adjusting and detecting, namely adding the same volume of boiler water into the conical flask which shows the colorless state in the step 1), oscillating for 10-30 seconds, observing, if the conical flask is colorless, indicating that the phenolphthalein alkalinity of the boiler water is less than 2mmol/L, if the conical flask shows the red state, indicating that the phenolphthalein alkalinity of the boiler water is 2-4mmol/L, adding a single phenolphthalein alkalinity reagent B into the conical flask which shows the red state in the step 1), if the conical flask is colorless, indicating that the phenolphthalein alkalinity of the boiler water is 4-16mmol/L, and if the conical flask is red, indicating that the phenolphthalein alkalinity of the boiler water is >16mmol/L, then needing to drain; The full alkalinity test comprises the following steps: 1) The basic detection comprises the steps of mixing a single full-alkalinity reagent C and a single water sample, oscillating for 10-30 seconds, observing color development, and if the color development is red-purple, indicating that the full alkalinity is less than 8mmol/L, and if the color development is green, indicating that the full alkalinity is more than or equal to 8mmol/L; 2) Dynamically adjusting and detecting, namely adding the same volume of boiler water into the conical flask which displays the purple color in the step 1), oscillating for 10-30 seconds, observing, if the boiler water still displays the purple color, indicating that the total alkalinity of the boiler water is less than 4mmol/L, if the boiler water displays the green color, indicating that the total alkalinity of the boiler water is 4-8mmol/L, adding a single total alkalinity reagent D into the conical flask which displays the green color in the step 1), and if the boiler water displays the purple color, indicating that the total alkalinity of the boiler water is 8-24mmol/L, and if the boiler water displays the green color, indicating that the total alkalinity of the boiler water is >24mmol/L, discharging is needed.
10. 10. The use of the reagent for rapidly detecting the alkalinity of industrial boiler water according to claim 8, wherein the mass volume ratio of the alkalinity reagent to the water sample is 1g (100-200) mL.

Description

Reagent for rapidly detecting alkalinity of industrial boiler water and application thereof Technical Field The invention belongs to the technical field of water quality analysis chemistry, and particularly relates to a reagent for rapidly detecting the alkalinity of industrial boiler water and application thereof. Background The industrial boiler is a core heat energy device in the field of industrial production, and the water quality working condition of the industrial boiler directly influences the operation safety, the heat efficiency and the service life of the boiler. If the alkalinity of boiler water is used as a key water quality index, the problems of boiler scaling, corrosion, water co-rising and the like are easily caused if the control is improper, the heat exchange efficiency is reduced, the energy consumption is increased, and the safety accidents such as boiler tube burst and the like are caused if the energy consumption is increased, so that the alkalinity of boiler water needs to be normalized and accurately detected. The current industrial boiler water alkalinity detection mainly depends on the traditional titration method, the method needs to be provided with complete glass instruments such as an acid-base standard solution, a burette, a conical flask and the like, and the operation flow is complex, a detector needs to sample and fix the volume of a water sample, then dropwise add a titrant and continuously oscillate, meanwhile, the indicator color change endpoint is observed, the whole process takes more than 10 minutes, and the requirements of quick inspection and real-time monitoring on an industrial site are difficult to meet. In addition, the traditional titration method has higher requirements on the operation proficiency of detection personnel, and the problems of subjective judgment error of a titration end point, insufficient reagent preparation precision and the like are easy to cause the deviation of detection results, and especially in small and medium-sized industrial enterprises or on-site inspection scenes, non-professional personnel are difficult to accurately finish detection operation. The existing rapid detection reagent products are designed aiming at low-complexity water quality scenes such as drinking water, domestic sewage and the like, and the reagent formula and the detection threshold are not matched with the characteristics of high salinity, high hardness and high alkalinity of industrial boiler water, so that the problems of unclear color development, narrow detection range, poor anti-interference capability and the like are easily caused when the rapid detection reagent products are directly used. For example, part of general alkalinity detection reagents can only cover the alkalinity range of 0-10mmol/L and cannot be adapted to the alkalinity range of 2-24mmol/L common to industrial boiler water, and most of the reagents are in a liquid form, so that the reagents have the defects of easy volatilization, short shelf life, inconvenient transportation and storage and the like, and are difficult to adapt to the harsh environment of an industrial site. In conclusion, the existing boiler water alkalinity detection means have the pain points of complex operation, low detection efficiency, insufficient specificity and the like, and the development of the alkalinity detection reagent which is adaptive to the characteristics of industrial boiler water, is simple and convenient to operate, has high detection speed and accurate results becomes a key requirement for solving the problem of rapid monitoring of industrial boiler water quality. Disclosure of Invention The first technical problem to be solved by the invention is to provide a preparation method of a reagent for rapidly detecting the alkalinity of industrial boiler water, the second technical problem to be solved by the invention is to provide a reagent for rapidly detecting the alkalinity of industrial boiler water, and the third technical problem to be solved by the invention is to provide an application of the alkalinity reagent for rapidly detecting the alkalinity of industrial boiler water. In order to solve the technical problems, the invention adopts the following technical scheme: The reagent for rapidly detecting the alkalinity of industrial boiler water comprises, by mass, 0.5-1.5 parts of a solid strongly acidic reagent, 0.02-0.05 parts of an indicator and 6-8 parts of an anticaking agent, 1-3 parts of the solid strongly acidic reagent and 6-9 parts of the anticaking agent, by mass, 2-4 parts of the solid strongly acidic reagent, 0.02-0.05 parts of the indicator and 6-8 parts of the anticaking agent, and 0.02-0.05 parts of the indicator; further, the solid strong acid reagent in the phenolphthalein alkalinity reagent A, the phenolphthalein alkalinity reagent B, the total alkalinity reagent C and the total alkalinity reagent D is selected from one or more of sodium bisulfate and sulfamic acid. Further,